EP0422069B1 - Wave screen plate and manufacturing method - Google Patents

Wave screen plate and manufacturing method Download PDF

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Publication number
EP0422069B1
EP0422069B1 EP89907492A EP89907492A EP0422069B1 EP 0422069 B1 EP0422069 B1 EP 0422069B1 EP 89907492 A EP89907492 A EP 89907492A EP 89907492 A EP89907492 A EP 89907492A EP 0422069 B1 EP0422069 B1 EP 0422069B1
Authority
EP
European Patent Office
Prior art keywords
screen plate
modular
plate assembly
sections
screen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89907492A
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German (de)
English (en)
French (fr)
Other versions
EP0422069A1 (en
Inventor
William Gero
Frank Paskowski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beloit Technologies Inc
Original Assignee
Beloit Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beloit Corp filed Critical Beloit Corp
Publication of EP0422069A1 publication Critical patent/EP0422069A1/en
Application granted granted Critical
Publication of EP0422069B1 publication Critical patent/EP0422069B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/16—Cylinders and plates for screens

Definitions

  • the present invention relates to improvements in apparatus for processing wood pulp and other fibrous fluid suspensions, and method for manufacturing the apparatus. More particularly, the apparatus and method relate to an improved screen for wood pulp, for removing foreign particles from a pulp slurry.
  • screens are utilized to separate acceptable fiber from unacceptable constituents in a slurry.
  • a typical screen as illustrated for example in GB-A-2195911 and US-A-4855038 the slurry flows through a perforate, cylindrical screen plate, which may be smooth, or which may present a contoured surface toward the stock flowing through the screen, to increase the effective screening area.
  • the screen plate openings are formed in different hole or hole and slot combinations for optimizing screening performance.
  • pulsations are generated in the slurry such as by passing a hydrofoil-shaped member past the screen plate.
  • the type of screen described has been expensive to use and maintain in that, even if only a small area of screen is damaged, the entire screen plate, which includes the screening surface, mounting surfaces and support members must be replaced, thereby presenting a costly operating expense.
  • an object of the present invention to provide a screening apparatus and a screen plate design wherein the necessity of an expensive machining manufacturing process is eliminated.
  • a further object of the present invention is to provide a screen plate structure wherein various modifications and alternatives of screen plate shape can be attained without prohibitive manufacturing costs, and wherein contours can be utilized which were heretofore not considered possible because of manufacturing limitations.
  • a further object of the present invention is to provide a screen plate structure wherein, for a given screen plate area, increased screening capacity is possible for increased throughput pulp screening rates, and wherein a variety of sizes and shapes are possible for the screen plate openings.
  • Another object of the present invention is to provide a screen plate forming process and a screen plate structure which can utilize relatively thin material to produce an aggressive profile for increasing the hydraulic capacity of the screen.
  • Yet another object of the present invention is to provide a modular screen plate structure which simplifies screen plate changing and which eliminates the need to change an entire screen plate when only a portion of the plate is damaged or worn.
  • a still further object of the present invention is to provide a screen plate structure and manufacturing process therefor which substantially reduce the manufacturing costs of a screen plate while improving the screening efficiency and throughput thereof.
  • Still another object of the present invention is to provide a screen plate structure and method of manufacturing which is more resistant to abrasive wear than heretofore known screen plates, thereby increasing the useful life of the screen plate when screening slurries containing highly abrasive contaminants.
  • a screen plate wherein relatively thin material is formed into a desired shape or contour, and the screen shape is formed in predetermined lengths and assembled into a modular type assembly.
  • Forming the contours can be performed by stamping, pressing, or other bending techniques not requiring machining.
  • the various shapes or contours into which the material is formed provide mechanical strength and rigidity, which allow using thinner material than that previously used for screen plates.
  • the thinner material allows for forming more aggressive contours, and makes possible the use of slot cutting techniques other than machining.
  • thinner material properly formed with new and different slot openings can increase screening efficiency and capacity while retaining or even improving screen plate strength.
  • a laser beam may be utilized to cut openings or slots ranging from .1 mm to .5 mm wide. These openings may be formed in greater lengths than are presently available from currently used machining methods, and this increases the total available open accepts flow area and production rate for a given size screen plate.
  • the modular design employs a rigid, strengthening pilot back ring and a varying number of mid or support rings and flange rings, all connected by tie rods with the annular screen plates clamped between each ring. This permits various hole and slot combinations within the same assembly.
  • the modular construction provides an inner contour permitting very close foil to plate gap settings. When a given section of the screen plate is damaged or worn out, only that section need to be replaced.
  • the support rings, tie rods, and undamaged and unworn screen plate sections can be reused, thereby substantially reducing costs for repairing worn or damaged screens.
  • abrasive resistant inserts can be inserted in the screen plate and retained by the retaining rings of the modular construction. As wear occurs, the inserts can be replaced at much less cost than replacing entire screen plates.
  • FIG. 1 illustrates a screening apparatus 8 wherein previously treated pulp is screened to remove foreign elements such as sheaves, bark, knots, particles of wood, dirt, glass, plastic, and the like.
  • a screen plate assembly is shown at 10, defining in the apparatus 8 an interior chamber 11 where the pulp to be screened flows in and an exterior chamber 12 where the screened pulp flows out after passing through the screen plate assembly.
  • the assembly is enclosed in a housing 13 which has an inlet, not shown, for the entrance of pulp to be screened into the chamber 11, and an outlet, not shown, leading from the chamber 11 for the foreign material such as the sheaves, bark, and dirt.
  • the accepted pulp flows out through an outlet 14.
  • the screen plate assembly 10 is stationary within the housing 13, and for aid in passing the liquid stock with pulp through the screen plate, and to help inhibit plugging, hydrofoils 18 are mounted for rotation within the cylindrical screen plate assembly.
  • the hydrofoils 18 are supported on arms of a rotary driven shaft 19, and rotate in a clockwise direction, as viewed in Figure 1.
  • the hydrofoils shown are merely illustrative of a suitable type, and it should be understood that the present invention can be used for screen plates of various types for various pulse, turbulence and combination pulse and turbulence generating rotors.
  • the screen plate assembly 10 includes cylindrical screen sections 16 and 17 which, without support, are essentially flexible and require rigidifying or strengthening for use in the pressurized environment of screen apparatus 8.
  • the necessary support and strengthening is provided by end rings 20 and 20a and intermediate support ring 21.
  • Each of the rings has grooves, such as illustrated by the grooves 23 and 24 in the ring 21 shown in Figure 2.
  • the grooves 23 and 24 are circular to hold the screen sections in a substantially cylindrical shape.
  • the grooves 23 and 24 have a radial dimension substantially equal to the radial thickness of the shaped screen plates.
  • the screen plates are formed from relatively thin material compared to the heretofore known machined screen plates.
  • the thin material is formed into various shapes or contours, generally undulated, so as to present a substantial amount of screening area to the stock.
  • Figures 5 through 10 illustrate contours which may be used, and which are capable of attainment with the structure and manufacturing methods of the present invention.
  • each of the shaped screen plates is positioned into the grooves in the end ring 20 or 20a and the intermediate ring 21, and the rings are pulled together to force the screen plates into the grooves.
  • axially extending rods 22 are provided, spaced circumferentially from each other, and the rods are provided at their ends with threads and nuts 22a so that the nuts can be tightened to pull the end rings toward each other and force the ends of the screen plates into the grooves.
  • the grooves are preferably tapered so that the slot becomes narrower in an inward direction toward the bottom of the groove, as indicated by the illustration of Figure 2.
  • the screen plates When the rods are tightened, the screen plates are pushed tightly into the tapered grooves so that the screen plates are held firmly in a fixed position, circumferentially.
  • the screens can be longer or shorter, or even greater in number, and additional reinforcing intermediate rings such as 21 may be employed between the ends of each of the adjacent screens.
  • Screening openings such as 25 and 26 extend through the thin, screen material, as indicated by the screens 16 and 17 shown in Figures 2, 3, and 4.
  • the thin material used in the present screen plate assembly can be provided with holes or slots of different sizes and shapes through manufacturing techniques, including the use of laser beam cutting, or other hole forming processes such as punching.
  • the holes or slots may be created before, during, or after the formation of the undulations in the sheet-like material.
  • the slots may range from .1 mm to .5 mm wide and be in greater lengths than presently possible, wherein screen plate openings are formed by machining processes.
  • the variety of sizes and lengths of openings that can be formed in a screen made of thin material can substantially increase the total available open accepts flow area of the screen, and thereby increase the production rate for a given size screen plate.
  • the present modular design employing one or more mid or support rings, such as shown at 21, and end rings, such as shown at 20 and 20a, allows for use of screen sections of different lengths and with different hole and slot combinations. Any number of sections of any length may be used, as well as screen plate contours, can be provided in a single screen. If wear or damage to any of the cylindrical screen sections occurs, the section can be replaced by loosening the axial tie rods and replacing or exchanging the section. This also enables replacement with substitute sections of different hole or slot arrangements so that, with a given piece of screening machinery, different screening operations can be achieved through easy replacement of screen sections. As will be seen from the drawing of Figure 1, access to the interior of the housing 13 is readily afforded by removal of the end plate 13a through removal of the bolts 13b. This permits withdrawal of the screen assembly for ready exchange or replacement of the screen sections.
  • the thin material of the screen sections may be stainless steel or similar sheet metal which is formed in a generally cylindrical shape having undulations extending around the circumference of the screen.
  • the undulations shown in Figure 5 may take the form of a series of upright and inverted U-shaped sections 27a and 27b, or, in other words, the screen essentially consists of a series of deep corrugations.
  • corrugations may be modified as illustrated in Figure 6 by a shaping of the U-shaped sections, and as illustrated in Figure 6, the U-shaped section may be formed so that one sidewall 28a of the U is a straight, substantially radial wall, whereas the other wall 28b has lower and upper straight portions 28c and 28d joined by a circumferential flat wall portion 28e.
  • the flat wall portion may perform an additional filtering or screening function and may include the same or different perforations than the remainder of the screen.
  • the flat, part circumferential portion also adds circumferential rib strength to the overall screen.
  • the undulations take the form of outwardly extending V-shaped ridges 29 having side walls 29a and 29b.
  • the inner base of the side walls is joined by a flat, generally partially circumferentially extending planar portion 29c. Again, all of the areas may supply screening openings and strengthen the screen structure.
  • the screen is formed by a series of ridges 30 with planar side walls 30a and 30b. At the base of one side wall 30b is a generally part circumferentially extending planar portion 30c which is joined to a curved base 30d. This arrangement functions to provide additional strength and screening area.
  • Figure 9 illustrates a screen formed of a series of ridges 31, with the ridges having side walls 31a and 31b of unequal length so that the angular slope of the side wall 31a is less than the slope of the side wall 31b. This again provides strength and provides a good cleaning effect relative to the hydrofoil which is moved past the inner surface of the curved screen.
  • Figure 10 illustrates a screen formed with a series of ridges 32, each having one flat side wall 32a with a shorter opposing side wall 32b. At the base of the shorter side wall is a flat, generally partly circumferentially extending portion 32c which joins a radially outwardly extending U-shaped portion 32d.
  • Figure 11 shows, perspectively, screen plate openings having a generally circular portion 50 with a linear portion 52 extending therefrom. These openings are shown in a top plan view in Figure 12.
  • Figure 13 illustrates a modification of the openings shown in Figures 11 and 12, in which a curved portion 54 is provided opposite the circular portion 50 on the linear section 52.
  • a zig-zag opening 56 is illustrated, which may extend substantially the entire length of a screen plate section, or may be provided in a series of patterns along the length of the screen plate section.
  • slotted profile arrangements may be provided to achieve aggressive or agitative profiles which enhance full performance.
  • louvered openings 58 are shown, in which a dome 60 is raised upwardly from the opening 62.
  • a flap 64 is left between two substantially parallel slot openings 66 and 68, which are joined at 70.
  • the flap 64 is attached at only one end and is otherwise defined by the slot openings 66, 68, and 70.
  • Either of the embodiments shown in Figure 15 can be readily formed by piercing or punching techniques to be described subsequently herein.
  • the various openings can be used individually or in combination on a single screen plate section, or in a plurality of sections in a single screen apparatus.
  • electrical, mechanical, or chemical polishing may be utilized to enhance the hydraulic capacity or throughput of the slotted surface.
  • one of the advantages of the present invention is that the strengthening provided by the modular structure allows the use of thin material which can be formed gently by bending. Therefore, highly polished metals can be used and the need for subsequent polishing and cleanup of the finished screen plate is minimized or even eliminated.
  • a series of cylindrical screen sections 16 and 17 are provided, each with perforations therethrough, such as illustrated in the forms of Figures 3 and 4.
  • the sections used in any screen may be identical, or the openings and/or profiles of the sections may be different.
  • the circumferential sections are supported by end rings 20 and 20a and intermediate rings 21 which have tapered grooves such as 23 and 24 for receiving the ends of the screens.
  • the screen plate is assembled by positioning the individual sections in the appropriate rings and inserting the axial rods 22 through the rings. Tightening the nuts 22a compresses the assembly and secures the rings and screen sections in place.
  • the completed assembly is mounted in the screen apparatus 8 in conventional manner.
  • Replacement of any of the screen sections can be quickly accomplished by removing the screen plate assembly 10 from the apparatus 8 and loosening the nuts 22a from the axial through rods 22. After freeing the sections from the rings, replacing, or exchanging the screen sections and reconnecting and tightening the rods can be completed quickly. Even if all the screen plate sections are replaced, the cost for doing it is substantially less than for replacing a conventional screen plate in that the rings and through rods of the present invention can be reused for substantial periods of time.
  • FIGS. 18 through 21 show a four step forming process within a forming machine.
  • the forming machine includes top and bottom forming units 80 and 82, respectively, each having some discrete and individually operating portions thereof, to be described subsequently.
  • the individual portions advance independently by means of pneumatic, hydraulic, or other actuators which will be well known to those versed in the art.
  • the forming machine has a bottom support member 84 and upwardly extending interlocking male members 86 and 88.
  • the interlocking members 86 and 88 may be stationarily mounted in the supporting member 84.
  • the shape being formed by the apparatus depicted in Figures 18 through 21 includes a relatively narrow, generally U-shaped section 90 and a relative wider modified W-shaped section 92.
  • the interlocking member 86 extends into the last completely formed narrow section 90.
  • a first forming section 94 from the upper unit 80 is advanced into the last completely formed wider section 92, and interlocks the material therein between it and the interlocking members 86 and 88.
  • the upwardly extending interlocking male members 86 and 88 define between them a female member for receiving the first forming section 94.
  • a second forming section 96 from the upper unit 80 advance downwardly towards the lower unit, and completes the formation of a second generally narrow shaped section 90a.
  • the forming sections 94 and 96 define between them a female section for receiving the interlocking member 88 of the lower unit.
  • the bottom portion of the next generally wider section 92a is formed. Clearance between adjacent surfaces of the upper and lower units when positioned as in Figure 19, is not substantially greater than the thickness of the material being formed.
  • a preformer including an upper section 100, a bottom section 102, and a side section 104 is advanced to generally shape the material into a predetermined pattern which aids the subsequent forming process, and ensures that the material being formed is shaped into the desired undulating pattern, rather than being pulled or stretched, thereby minimizing the generation of built-in stresses.
  • FIG. 22 through 27 An alternate forming process and apparatus therefore is shown in Figures 22 through 27.
  • the forming apparatus again includes a top section 120 and a bottom section 122 for creating a contoured pattern similar to that shown in Figures 18 through 21.
  • the various parts of the upper and lower sections do not move individually. Each section moves as a unit.
  • the top forming unit 120 includes generally wider male forming fixtures 124, 126, 128, and 130. Disposed between the male fixtures are the generally narrower shaped female fixtures 132, 134, and 136.
  • the bottom forming unit includes complimentary fixtures, including generally wider female fixtures 140, 142, 144, and 146; and generally narrower male fixtures 148, 150, and 152.
  • top and bottom forming units have again moved apart vertically.
  • the top forming unit has moved one pattern back to the right.
  • the top and bottom units have again closed, thereby forming yet another of the undulating patterns.
  • any number of different shapes or patterns may be formed, which may enhance the hydraulic capacity or throughput of a given screen plate, depending upon its application.
  • the patterns shown in Figures 5 through 10 as well as a variety of other patterns, can easily be formed in the relatively thin material through the press forming techniques shown generally in Figures 18 through 27.
  • FIG. 28 Another advantage obtained from using the relatively thin material that can be employed advantageously in screen plates of the present invention is that the hole or slot forming process can be incorporated with the undulating pattern forming process.
  • a press forming operation is shown for forming the pattern generally shown in Figure 11, and incorporation a punch dye 170 for forming the louvered openings shown in Figures 15 and 16.
  • Such a formation process greatly simplifies and reduces the cost for forming the screen plate sections, thereby obtaining even greater financial advantages for screen plate manufacture.
  • the manufacturing and assembly method of the present invention make possible other modification for specific applications.
  • abrasive contaminants such as metals, sand, plastic, and glass often found in recycling wastepaper
  • conventional screen plates wear out rapidly.
  • the modular design of the current screen plates permits the use of highly abrasive-resistant inserts in the screen plate.
  • inserts 180 and 182 are shown disposed in the corrugations of the screen plate.
  • the modular design incorporating clamping rings will also clamp the abrasive-resistant inserts in place, along with the screen plate sections. Further, the modular design also permits replacement of worn or damaged inserts as needed.
  • a secondary aggressive profile or shape can be produced. It is possible to further increase the hydraulic capacity or throughput of a given screen plate by the use of inserts, whether or not the inserts are used for abrasion resistance.
  • the ring 220 includes grooves having substantially axially horizontal sections 222 opposite the sides 214 and an angular section 224. The edge of the screen plate sections are crimped correspondingly.
  • the mounting ring 230 includes grooves having generally arcuate shaped sections 232, and again the edge of the screen plate sections are crimped correspondingly.
  • any of the shapes illustrated in Figures 37, 38, and 39; as well as a variety of other shapes can be utilized to maintain the rigid and stationary mounting within the mounting rings, while offsetting the screen plates so that the inner surface of the rings and the inner surface of the plates correspond, thereby not limiting the minimum gap allowable between the rotor and the screen plate inner surfaces.
  • the present invention achieves many desirable objectives for screen plate design.
  • the modular construction permits wide flexibility in screen plate shape, hole or slot formation, and screen plate utilization. Manufacturing and maintenance costs are significantly reduced in that the manufacturing techniques which can be used are less expense than those previously used for the necessary thick-walled screen plate material for previous designs. Replacement due to damage, failure, or alternate operation can be limited to those parts actually requiring replacement.
  • the screen can readily be adapted to different uses by adapting the shape of slot opening, and by the use of inserts for wear resistance or increased aggressiveness of the surface contour.
EP89907492A 1988-06-10 1989-06-02 Wave screen plate and manufacturing method Expired - Lifetime EP0422069B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US206151 1988-06-10
US07/206,151 US4954249A (en) 1988-06-10 1988-06-10 Wave screen plate

Publications (2)

Publication Number Publication Date
EP0422069A1 EP0422069A1 (en) 1991-04-17
EP0422069B1 true EP0422069B1 (en) 1993-08-04

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EP89907492A Expired - Lifetime EP0422069B1 (en) 1988-06-10 1989-06-02 Wave screen plate and manufacturing method

Country Status (18)

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US (1) US4954249A (no)
EP (1) EP0422069B1 (no)
JP (1) JP2593719B2 (no)
KR (1) KR940010025B1 (no)
CN (1) CN1017170B (no)
AT (1) ATE92553T1 (no)
AU (1) AU631557B2 (no)
BR (1) BR8907472A (no)
CA (1) CA1336278C (no)
CH (1) CH678954A5 (no)
DE (1) DE68908179T2 (no)
DK (1) DK30290A (no)
ES (1) ES2013537A6 (no)
FI (1) FI100059B (no)
NO (1) NO176486C (no)
PH (1) PH27475A (no)
WO (1) WO1989012137A1 (no)
ZA (1) ZA894372B (no)

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Also Published As

Publication number Publication date
JPH03502118A (ja) 1991-05-16
KR940010025B1 (ko) 1994-10-20
JP2593719B2 (ja) 1997-03-26
CH678954A5 (no) 1991-11-29
DK30290A (da) 1990-03-23
AU631557B2 (en) 1992-12-03
NO176486C (no) 1995-04-12
KR900702128A (ko) 1990-12-05
DE68908179D1 (de) 1993-09-09
CN1017170B (zh) 1992-06-24
FI100059B (fi) 1997-09-15
ES2013537A6 (es) 1990-05-01
CA1336278C (en) 1995-07-11
FI906054A0 (fi) 1990-12-07
NO905249L (no) 1990-12-05
DK30290D0 (da) 1990-02-06
NO176486B (no) 1995-01-02
CN1040239A (zh) 1990-03-07
PH27475A (en) 1993-07-23
BR8907472A (pt) 1991-05-28
WO1989012137A1 (en) 1989-12-14
NO905249D0 (no) 1990-12-05
EP0422069A1 (en) 1991-04-17
US4954249A (en) 1990-09-04
ATE92553T1 (de) 1993-08-15
AU3831989A (en) 1990-01-05
DE68908179T2 (de) 1994-01-05
ZA894372B (en) 1990-08-29

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